Efeito da cafeína e do cádmio na próstata do rato wistar púbere: proliferação e morte de células epiteliais e alterações estromais
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Data
2008-09-11
Autores
Lacorte, Lívia Maria [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O câncer de próstata e a hiperplasia prostática benigna são as duas principais afecções do sistema genital masculino após a quinta década de vida. Além de aspectos étnicos, etários, genéticos, estudos sobre a contaminação ambiental por agentes químicos carcinogênicos, dos hábitos alimentares e do estilo de vida vêm adquirindo importância no entendimento das causas destas afecções. A exposição a contaminantes ambientais, tais como o cádmio e a ingestão de bebidas contendo cafeína têm sido associados com o aparecimento do câncer de próstata e com a hiperplasia prostática benigna, respectivamente. Além disso, existem evidências experimentais de que a exposição da próstata em períodos críticos da sua morfogênese e de rápido crescimento a disruptores endócrinos pode gerar alterações permanentes que levarão ao aparecimento de afecções nos indivíduos adultos e idosos. Neste sentido, por exemplo, a partir da puberdade é comum os homens adquirirem o hábito de fumar e/ou de ingerir bebidas estimulantes, estando, portanto, expostos ao cádmio, presente na fumaça do cigarro, e/ou a cafeína, presente nas bebidas. Desta forma, este trabalho avaliou os efeitos, isolados e combinados, do cádmio e da cafeína, em baixas concentrações, sobre a morfologia e fisiologia da próstata de ratos púberes. Para isto, ratos Wistar com 60 dias de idade foram divididos em quatro grupos (n=15), os quais receberam, via oral, na água de beber, pelo período de 30 dias: Água, Cádmio (10ppm), Cafeína (10mg/l) ou Cafeína+Cádmio, e as próstatas dorsolaterais e ventrais foram processadas histologicamente e foram feitas análises morfológicas, citoquímicas para fibras de colágeno, morfométricas e imunocitoquímicas. Também foram determinadas as concentrações plasmáticas de cádmio e testosterona e intra-prostática de cádmio no...
The prostate cancer and the benign prostate hyperplasia are the main male genitourinary system diseases after the fifty. Besides ethic, age and genetic aspects, studies about environmental contamination, diet and life stile have also emerged as important factors involved in the etiology of these diseases. The exposure to cadmium and the intake of caffeine-containing beverage have been associated with appearing of the prostate cancer and benign prostate hyperplasia, respectively. Furthermore, there are experimental evidences that prostate exposures to endocrine disruptors during a critic period of its morphogenesis and growth may influence the onset of late-life disease. In this sense, for example, from puberty on, many males became smokers and/or start to intake energetic beverage or even yet coffee, thus being exposed to cadmium, from cigarettes and/or to caffeine, from beverage. So, here we investigated the effects of cadmium and caffeine, isolated or combined, in low doses, on rat prostate morphology during puberty. For this, male Wistar rats (n=60), 2 months-old, were divided into four experimental groups (n=15), that received by drinking water and during 30 days: tap water, cadmium (10ppm), caffeine (10ppm), cadmium plus caffeine. The prostatic lobes ventral and dorsolateral were dissected out, weighted and processed for histology. It were made morphological and morphometrical analyses; cytochemistry for collagen and reticular fibers and immunocytochemistry for Ki-67. It were also determined the plasma concentrations of testosterone and cadmium and the ventral lobe intraprostatic concentration of cadmium. The plasma and intraprostatic concentrations of cadmium were increased in the animals treated with cadmium and cadmium plus caffeine. In the conditions of this experiment, the exposure to these two agents did not alter significantly neither the prostatic... (Complete abstract click electronic access below)
The prostate cancer and the benign prostate hyperplasia are the main male genitourinary system diseases after the fifty. Besides ethic, age and genetic aspects, studies about environmental contamination, diet and life stile have also emerged as important factors involved in the etiology of these diseases. The exposure to cadmium and the intake of caffeine-containing beverage have been associated with appearing of the prostate cancer and benign prostate hyperplasia, respectively. Furthermore, there are experimental evidences that prostate exposures to endocrine disruptors during a critic period of its morphogenesis and growth may influence the onset of late-life disease. In this sense, for example, from puberty on, many males became smokers and/or start to intake energetic beverage or even yet coffee, thus being exposed to cadmium, from cigarettes and/or to caffeine, from beverage. So, here we investigated the effects of cadmium and caffeine, isolated or combined, in low doses, on rat prostate morphology during puberty. For this, male Wistar rats (n=60), 2 months-old, were divided into four experimental groups (n=15), that received by drinking water and during 30 days: tap water, cadmium (10ppm), caffeine (10ppm), cadmium plus caffeine. The prostatic lobes ventral and dorsolateral were dissected out, weighted and processed for histology. It were made morphological and morphometrical analyses; cytochemistry for collagen and reticular fibers and immunocytochemistry for Ki-67. It were also determined the plasma concentrations of testosterone and cadmium and the ventral lobe intraprostatic concentration of cadmium. The plasma and intraprostatic concentrations of cadmium were increased in the animals treated with cadmium and cadmium plus caffeine. In the conditions of this experiment, the exposure to these two agents did not alter significantly neither the prostatic... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Biologia celular, Morfologia (Biologia), Próstata - Câncer, Cádmio - Câncer de próstata, Agentes químicos carcinogênicos, Hiperplasia prostática benigna, Prostate cancer
Como citar
LACORTE, Lívia Maria. Efeito da cafeína e do cádmio na próstata do rato wistar púbere: proliferação e morte de células epiteliais e alterações estromais. 2008. 87 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Botucatu, 2008.